The Pros and Cons of Using an 18650 Pack in your DIY Lithium Ion Battery

If you’re planning on building your own lithium-ion battery, then you’ve probably heard of the 18650 pack. These cylindrical cells are a popular choice for DIY battery projects thanks to their high energy density and availability. However, like any component in an electronic project, there are pros and cons to using them. In this blog post, we’ll explore both sides of the argument so that you can make an informed decision when choosing whether or not to use an 18650 pack in your next project!

What is an 18650 Pack?

An 18650 pack is a collection of cylindrical lithium-ion cells that are commonly used in electronic devices like laptops and flashlights. The name “18650” refers to the dimensions of each cell, which is roughly 18mm in diameter and 65mm in length.

One of the biggest advantages of using an 18650 pack for DIY projects is their high energy density. This means they can store a large amount of energy relative to their size, making them ideal for portable electronics or other applications where space is limited.

Another benefit of these cells is that they are widely available and relatively inexpensive compared to other types of lithium-ion batteries. This makes it easier to source parts for your project and keep costs down.

It’s also worth noting that many manufacturers produce high-quality 18650 packs with built-in protection circuits that prevent overcharging or discharging, ensuring safe operation even when connected in series or parallel configurations.

If you’re looking for a reliable and cost-effective way to power your DIY project, then an 18650 pack could be just what you need!

Pros of Using an 18650 Pack

Using an 18650 pack in your DIY lithium-ion battery comes with several advantages. Firstly, these packs are widely available and popular among the DIY community, making them easy to source from various vendors. This means that you can easily find the right pack for your project without much hassle.

Secondly, 18650 packs offer a high energy density which makes them ideal for applications where space is limited. This means that you can use fewer cells to achieve higher voltages while maintaining a small form factor.

Thirdly, these packs come with built-in protection circuits that prevent overcharging and discharging which makes them safer to use than other types of lithium-ion batteries. Additionally, they have low self-discharge rates which means they can hold their charge for longer periods of time.

Using an 18650 pack allows you to customize the capacity of your battery by adding or removing cells as needed. This gives you greater flexibility in designing batteries for specific projects while keeping costs low.

Using an 18650 pack has several benefits such as availability, high energy density, safety features and customization options that make it a great choice for DIY enthusiasts looking to build their own lithium-ion batteries.

Cons of Using an 18650 Pack

Using an 18650 pack in DIY Lithium Ion batteries comes with its own set of drawbacks. Let’s take a closer look:

Firstly, cost can be a significant downside for some people. While the initial investment may not seem like much, purchasing enough cells to create a battery pack can quickly add up.

Secondly, safety is another concern when it comes to using these packs. If they are not handled properly or overcharged, they have been known to catch fire or even explode.

Thirdly, creating your own lithium-ion battery requires knowledge and skill. It’s essential to understand how to assemble the cells correctly and what materials and equipment are necessary for the process.

Another drawback worth mentioning is that 18650 packs tend to have lower energy density compared with other types of batteries such as LiPo (Lithium Polymer) or LiFePO4 (Lithium Iron Phosphate).

If you’re looking for high voltage output from your battery then an 18650 pack may not be suitable as individual cells only provide around 3.6-3.7 volts each.

While there are undoubtedly cons associated with using an 18650 pack in DIY Lithium Ion batteries, many hobbyists continue to use them due to their versatility and reliability when handled correctly.

How to Choose the Right 18650 Pack for Your Battery

When it comes to choosing the right 18650 pack for your DIY lithium ion battery, there are several factors to consider. The first thing you need to determine is the capacity and voltage requirements of your project. You should choose a pack that has enough capacity and voltage to power your device.

Another important factor is the quality of the cells in the pack. It’s recommended that you use high-quality cells from reputable brands like Panasonic or Samsung, as these have been tested and proven reliable over time.

You should also consider whether you want a protected or unprotected pack. Protected packs have built-in circuitry that can help prevent overcharging, overheating, and short circuits. Unprotected packs do not have this feature but may be more affordable.

The size and shape of the pack is another consideration. Make sure it fits within the space constraints of your device without compromising its structural integrity.

Consider purchasing from a supplier with good customer service and guaranteed authenticity of their products. This will ensure that any issues can be resolved quickly and efficiently if they arise.

By taking all these factors into account when selecting an 18650 pack for your DIY lithium ion battery project, you’ll be able to create a safe and reliable power source for whatever application you need it for!


After weighing the pros and cons of using an 18650 pack in your DIY lithium-ion battery, it is clear that this type of battery can be a great option for many projects. The high energy density and long lifespan make it an excellent choice for applications that require a lot of power.

However, it’s essential to consider the potential risks associated with using these packs, such as overheating or short-circuiting. It’s crucial to choose a quality 18650 pack from a reputable supplier and follow all safety guidelines when building your battery.

If you prioritize performance and longevity over ease of use and cost-effectiveness, then an 18650 pack may be the right choice for your next project. Just remember to take all necessary precautions to ensure safe operation.